fluid logic circuit

例句：

1. 1. The liquid flowed throughthe tube easily.
   液体很容易地流过管子。
2. 2. The speech was fluid and easy tounderstand.
   演讲语速快，容易理解。
3. 3. The river isknown for its fluid currents.
   这条河以其流动的水流而闻名。